Mason's Bear

Bears generate in forests and open landscapes, where they wander and look around the area. A bear is hostile by default, but it only attacks once it has been attacked itself, and a player who leaves it alone keeps it friendly and non-aggressive, so nearby exploration stays safe. Provoking a bear changes its mood at once, and it turns defensive, using strong attacks to protect itself and its territory.

The mod is built around that behavior system, which makes bears act like real animals instead of ordinary mobs that attack on sight. It fits survival worlds and multiplayer servers alike, and it is meant for players who want encounters with wildlife to carry some weight. Mason's Bear is a Forge mod for 1.20.1 only, released under All rights reserved, so it is not open source. Client and server both need it, so every player on a server that runs it must install it too.